Commercial Unit of Energy


 
 
Concept Explanation
 

Commercial Unit of Energy

Commercial Unit of Energy : - The SI unit of energy is the joule (J). But the commonly used unit for electrical - energy consumption is the kilowatt-hour (kWh). If energy is consumed at the rate of 1 Kilo Joule / second, i.e., at the rate of 1 Kilo Watt, and this continues for 1 hour then the total energy consumed is called 1 KiloWatt - Hour.

Thus,                                                           1 ; kWh=1 ; kW times hour

                                                                        =(1000 ; W)times (3600; s)

                                                                        =(1000 ; J/s)times (3600;s)

                                                                        =(3600000; ; joules)=3.6 times 10^6; J.

                                                                              1 kWh ;=;3.6;times:10^6 J

For electrical - energy consumption in houses, factories, shops, etc, kilowatt - hour is simply called ' unit'. So, the cost of electrical energy is given in terms of Rs/unit.

For example :  If electricity costs Rs. 5.00/unit, it means that consumers pay Rs 5.00 for every unit (kWh) of electrical energy consumed.

Sample Questions
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Question : 1

Which of the following are correct :

(a) The SI unit of energy is the joule (J).

(b) The commonly used unit for electrical - energy consumption is the kilowatt-hour (kWh).

(c) If energy is consumed at the rate of 1 Kilo Joule / second, i.e., at the rate of 1 Kilo Watt.

Right Option : D
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Question : 2

1 kWh equals to ______________________.

Right Option : D
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Explanation
Question : 3

Watt sec represents the unit for ____________________

Right Option : A
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Explanation
 
 


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